Why is "UVs" menu not visible?
That menu shows up in Edit mode, and only when the mesh is already UV unwrapped.  

(Click on the images to get a larger view)
Object mode:
    

Edit mode, not yet unwrapped:
    

Edit mode, unwrapped:
    

To unwrap, make sure you're in Edit mode, then hit U or click Mesh > UV Unwrap and select a suitable option from the menu that shows up.